AFP Forensics attended the incident location and established a crime scene.

In a second separate incident police attended the Griffith Park Nature Reserve, adjacent to the Brumbies headquarters, following reports of a grass fire.

ACT Fire and Rescue, along with ACT Parks and Wildlife Rangers, and several players from the Brumbies rugby squad were quickly on hand to extinguish the fire prior to the police arriving. Police are treating the fire as suspicious.

Anyone who may have been in the Stony Creek or Griffith Park Nature Reserve areas at the time of the fires and can assist police with their investigation is urged to contact Crime Stoppers on 1800 333 000 or at www.act.crimestoppers.com.au. Information can be provided anonymously.